Yeah thanks. I flashed the cards with new timings and copied over the .sys file and used wattman to make adjustments. I can confirm 3 days mining with Sapphire  RX470 OC 4GB at 25.5Mhs each. Total draw at the wall for whole setup with 3 of these cards is 470w with monitor off. 500w with monitor on :-) Best settings is core 1050/820 and GPU 1850/850. This is dual mining ETH and SIA.